[Kea-users] promote passive-backup Backup server to active?

[Chad Catlett]

I have always interpreted the use case for passive-backup as very much a choose your own adventure scenario.

Unfortunately the admin docs don't really give you enough information to properly arm the foot cannons.

Forewarning: you might be venturing into hic sunt dracones territory.

Here are two maps for your quest:

https://gitlab.isc.org/isc-projects/kea/-/wikis/designs/High-Availability-Design

https://reports.kea.isc.org/dev_guide/d3/d96/libdhcp_ha.html

Enjoy

-chad



----------------------------------------

Feb 2, 2022 09:15:42 David Ramsey <dmr at ramseyfamily.org>:

> Correction - rather than change "this-server-name" I swap the primary/backup role in the peers list.
> I couldn't find a way to do that via API without replacing the entire configuration via config-set.
> 
> Thanks folks, --dmr
> 
> On Wed, Feb 2, 2022 at 9:53 AM David Ramsey <dmr at ramseyfamily.org> wrote:
>> We are concerned about losing heartbeats between distant servers and encountering a "split brain" scenario, so we are considering a more manual failover using the passive-backup mode of HA.
>> 
>> What is the best practice for promoting a backup server to active?  Docs simply say that it "requires manual intervention from the administrator".
>> 
>> I can't seem to find a native API mechanism for this.  The best way I can think of seems to be ensuring that the primary can't come back online and then changing the passive-backup server's "this-server-name" to BE the primary.
>> 
>> This seems like a kludge.  How are others doing this?
>> 
>> Thanks!  --dmr
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